1Saying "BOMB" a hundred times, because of Tourette Syndrome
Sadly, that's exactly what happened: he said "bomb" as many as 100 times during the check-in process. He said he had the Boston Marathon bombings on his mind, and as he became more nervous the problem worsened. The Transportation Security Administration let him board, but a Jet Blue pilot kicked him off the plane before departure. The New York-based airline issued a statement saying the pilot initially had a security concern but later determined the situation was "innocuous" and offered Doyle a spot on the next flight. (Source)
2Singing Whitney Houston's "I Will Always..."
The solo performance began shortly after the flight departed from Los Angeles, and her crooning quickly became too much for passengers and staff on the domestic flight. That's why the pilot was forced to change course halfway through the six hour flight and make an unscheduled stop at Kansas City so officers could escort the woman from the plane.
After being interviewed, the woman was released without charges, but American Airlines refused to fly her to her destination.
3Saying "BYE, BYE PLANE" as the aircraft prepared for liftoff
When Kate refused a flight attendant's request to medicate her son with Benadryl to silence the baby and make him stop saying "bye bye,” the flight attendant announced that they were returning in order to get them out of the airplane. Very quickly, what started as an unpleasant flight became no flight at all. (Source)
5Wearing Baggy Pants
Marman's pants were below his buttocks but above the knees, and his boxer shorts were showing. Police asked to Marman to pull up his pants, but he refused, which was the reason he was then asked to leave the plane.
Marman's mother told the media that her son had attended a friend's funeral and was "still in an emotionally raw state.” (Source)
After a 45 minute delay in Detroit, the man allegedly turned to his seatmate and said, "What's taking so fucking long to close the overhead compartments? What the fuck is going on?” A flight attendant overheard him and had the plane return to the gate where police officers boarded the plane and escorted him off.
After the incident, Sayegh told the Media that he was not drunk, just hungover. (Source)
7Crying about her father's heart attack and a fear of flying
To relieve her anxiety she ordered a glass of wine from the hostess, but the flight attendant told Wheatley she'd had enough, even though Wheatley hadn't had any wine on the plane.
After the misunderstanding with the flight attendant, the sisters were removed from the flight, and Southwest did pay for a hotel room and meal that night as well as re-booking them on a flight to Dallas the next day. (Source)
8Being too tall
The passenger states that he tried to get an exit row seat for additional room, but none were available when he purchased his tickets.
Once aboard the plane, a flight attendant tripped over his legs while walking and demanded that he fit his legs fully into his seat. The passenger calmly explained how he tried to get another spot and that the phone operator said it would be the flight attendant's problem.
The flight attendant stormed out and another staff member explained that he must remove his legs from the aisle or leave the flight. Shortly thereafter, a third airline official showed up and told the passenger he must get off the plane. (Source)
The flight attendants gave her water, and a doctor gave her the OK to make the 10-hour trip, yet the captain still returned the airplane to the gate to drop off the girl and one of her teacher's, Maile Kawamura.
The captain felt he was acting in the best interest of the girl and the other passengers on the flight, and Continental reimbursed both seats. They were forced to make the trip home the next day. (Source)
10Taking a picture of rude air stewards
However, once she took her seat and turned off her iPhone, the employee, named Tonialla G., got on the plane, confronted her and ordered her to delete the photo. To make it worse, Tonialla informed the pilot and considered Dewitt a security risk, which then led to the photographer being escorted off the plane and barred from flying. (Source)